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The Effects and Mechanisms of Continuous 7-Day Hypobaric Hypoxia Exposure on Sleep Architecture in Rats.
Fang Li1,2, Xianxie Zhang2, Anping Ye2
1School of Traditional Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou 510006, China.
International Journal of Molecular Sciences
|June 13, 2025
View abstract on PubMed
Summary
High-altitude exposure disrupts sleep architecture by altering wakefulness, slow-wave sleep, and paradoxical sleep. This study identifies key molecular mechanisms, including inflammation and circadian dysfunction, offering a new animal model for altitude-induced insomnia.
Area of Science:
- Physiology
- Sleep Medicine
- Altitude Research
Background:
- High-altitude environments are linked to insomnia, impacting health and performance.
- Understanding altitude-induced sleep disruption is crucial for developing interventions.
Purpose of the Study:
- To investigate the mechanisms of sleep disruption caused by hypobaric hypoxia.
- To establish a validated animal model for studying altitude-related sleep disorders.
Main Methods:
- Rats were exposed to hypobaric hypoxia (5500 m) for 7 days.
- EEG/EMG telemetry monitored sleep, alongside physiological, biochemical, transcriptomic, and proteomic analyses.
Main Results:
- Hypobaric hypoxia altered sleep architecture, increasing wakefulness and paradoxical sleep, while decreasing slow-wave sleep and circadian rhythm amplitude.
- Biochemical and molecular analyses revealed oxidative stress, inflammation, HPA axis activation, neurotransmitter imbalance, and circadian gene dysregulation.
- Specific molecular changes included OX2R upregulation, 5-HT1A downregulation, and altered lipid metabolism and IL-17 signaling.
Conclusions:
- Hypobaric hypoxia disrupts sleep through a combination of oxidative stress, inflammation, HPA axis hyperactivity, neurotransmitter imbalance, and circadian clock dysfunction.
- The study provides a robust preclinical model for exploring altitude-induced insomnia mechanisms and identifying therapeutic targets.
